Blue London City University staff ID badge

I lost my blue City University staff ID badge yesterday around 3pm outside Tate Modern on Bankside, near the Millennium Bridge. It's a standard credit-card sized badge—the left side has my photo and the top right shows a tiny London crest; the back includes a faint department code ENG-12, and the lower edge is slightly bent. There’s also a small scratch along the bottom edge that catches on my pocket when I carry it. I really need it back—it's essential for office access and I’ve already flagged it with security, but no luck so far. If you find it, please drop it at Tate Modern reception or message me here; I’d be incredibly grateful.